CHAPTER IX 



MIGRATION DATA 



There are certain data regarding the arrival 

 and departure of our birds which it is not only 

 interesting to keep for one's own reference, but 

 which can be made of service to any of the va- 

 rious organizations compiling such material. 

 The Biological Survey of the United States De- 

 partment of Agriculture is perhaps the largest 

 and best organized. There are varied questions 

 asked on blanks of this type but if you wish to 

 keep a brief record of your own migration obser- 

 vations covering a period of several years, I think 

 the following scheme is as good as any. 



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